检验医学 ›› 2017, Vol. 32 ›› Issue (7): 642-646.DOI: 10.3969/j.issn.1673-8640.2017.07.020

• 实验室管理_论著 • 上一篇    下一篇

医学实验室血清K+、Na+、Cl-测量不确定度评估及检测质量改进分析

潘锡龙, 刘小冬, 黄绍芬   

  1. 广东省中山市东升医院检验科,广东 中山 528414
  • 收稿日期:2016-06-06 出版日期:2017-08-08 发布日期:2017-08-09
  • 作者简介:null

    作者简介:潘锡龙,男,1980年生,学士,副主任技师,主要从事实验室质量管理工作。

Measurement uncertainties for the determinations of serum K+,Na+ and Cl- and their quality improvement

PAN Xilong, LIU Xiaodong, HUANG Shaofen   

  1. Department of Clinical Laboratory,Dongsheng Hospital,Zhongshan 528414,Guangdong,China
  • Received:2016-06-06 Online:2017-08-08 Published:2017-08-09

摘要:

目的 评估医学实验室离子选择电极(ISE)法检测血清钾离子(K+)、钠离子(Na+)和氯离子(Cl-)的测量不确定度(MU),提高检测质量。方法 参考中国合格评定国家认可委员会(CNAS)2012年发布的《医学实验室——测量不确定度的评定与表达》,采用“自上而下”方法,联合室内质量控制(IQC)和室间质量评价(EQA)数据评估K+、Na+、Cl-的相对扩展不确定度(Urel),对2个主要分量[Ucrel(bias)和Urel(Rw)]分别设定管理目标,将未达标项作为提高检测质量的重点。结果 当K+水平在3.64~4.41和5.70~7.00 mmol/L时,其MU分别为8.84%和7.76%,Ucrel(bias)未达标,Urel(Rw)达标,ISE法检测K+的正确度性能需改进;当Na+水平在106~122和130~152 mmol/L时,其MU分别为5.20%和4.60%,Ucrel(bias)和Urel(Rw)均未达标,ISE法检测Na+的正确度和精密度性能均需提高;当Cl-水平在68.9~78.3和96.4~107.9 mmol/L时,其MU分别为7.15%和6.86%,Ucrel(bias)和Urel(Rw)均未达标,ISE法检测Cl-的正确度和精密度性能均需提高。结论 在医学实验室检测质量的管理工作中,参照CNAS文件,联合IQC和EQA数据评估并分析MU及其主要分量,能够明确具体检测性能的不足,以采取有针对性的改进措施,从而进一步提高检测质量。

关键词: 医学实验室, 钾, 钠, 氯, 离子选择电极, 测量不确定度

Abstract:

Objective To evaluate the measurement uncertainties(MU)for the determinations of serum potassium ion(K+),sodium ion(Na+)and chlorinum ion(Cl-)by ion selective electrode(ISE),and to improve the quality. Methods According to the Medical Laboratory-Evaluation and Expression of Uncertainty of Measurement published by China National Accreditation Service for Conformity Assessment(CNAS)in 2012,the relative expanded uncertainties(Urel)of serum K+,Na+ and Cl- were assessed by "top-down" method with the data of internal quality control(IQC)and external quality assessment(EQA). The 2 main components [bias Ucrel(bias)and reproducibility Urel(Rw)] were set as goals. When the Ucrel(bias)or Urel(Rw)was beyond the goals,the accuracy or precision should be improved further. Results When the levels of K+ were 3.64-4.41 and 5.70-7.00 mmol/ L,the MU were 8.84% and 7.76%,respectively,the Ucrel(bias)were beyond the goals,the Urel(Rw)were not beyond the goals,and the accuracy should be improved. When the levels of Na+ were 106-122 and 130-152 mmol/L,the MU were 5.20% and 4.60%,the Ucrel(bias)and Urel(Rw)were beyond the goals,and the accuracy and precision should be improved. When the levels of Cl- were 68.9-78.3 and 96.4-107.9 mmol/L,the MU were 7.15% and 6.86%,the Ucrel(bias)and Urel(Rw)were beyond the goals,and the accuracy and precision should be improved. Conclusions In the management of determination quality,the insufficiency of determination could be found by analyzing MU and 2 main components which are assessed with the data of IQC and EQA and CNAS technical reports,which can be improved further.

Key words: Medical Laboratory, Potassium, Sodium, Chlorinum, Ion selective electrode, Measurement uncertainty

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